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What were the other alignment numbers for your car?
It's possible that a problem with rear toe could make it pull to one side, but it would require a difference in toe from one side to the other. If the shop only gave you one number for rear toe, it's likely "total toe". Total toe tells you how close to parallel the two wheels are to each other, but it doesn't tell you anything about the angle of the wheels with respect to the car itself or the other axle.
For example, this would be zero rear toe:
| | <-- pretend this is a top view of your front wheels
| | <-- rear wheels - parallel to each other, so zero toe
But this is also zero rear toe:
| | <-- front wheels
/ / <-- rear wheels - still parallel to each other, so still zero toe
Notice that the rear wheels are parallel to each other (zero total toe) in both cases. The car would track straight in the first example, but it wouldn't in the second. Despite that, both would show zero total toe in the rear.
Some alignment machines can measure toe for each wheel separately relative to an imaginary perfectly straight center line down the middle of the car. If all other alignment numbers look good, you might want to find a shop that can do something like this.
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